linux-kernel - Re: [PATCH 0/4] perf maps/symbols: Various assert fixes

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Date: Tue, 7 May 2024 12:12:36 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: James Clark <james.clark@....com>
Cc: linux-perf-users@...r.kernel.org, atrajeev@...ux.vnet.ibm.com,
	irogers@...gle.com, Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] perf maps/symbols: Various assert fixes

On Tue, May 07, 2024 at 12:11:42PM -0300, Arnaldo Carvalho de Melo wrote:
> On Tue, May 07, 2024 at 03:12:04PM +0100, James Clark wrote:
> > A few different asserts are hit when running perf report on minimal
> > Arm systems when kcore is used, or the .debug/ info can't be loaded or
> > /boot isn't mounted etc.
> > 
> > These result in some less common paths being hit for resolving symbols
> > and things are done in an order that breaks some assumptions. I'm not
> > sure if we could do something to make the tests pick this up, but maybe
> > not easily if it would involve mocking the filesystem or even a specific
> > kernel. I tried a few different variations of --kcore and --vmlinux
> > arguments but ultimately I could only reproduce these issues by running
> > on specific kernels and root filesystems.
> 
> Please consider adding Fixes tags so that we can help the work of
> backporters/stable?

Sorry, you already did it for the last two patches in the series, so you
couldn't find easily what were the csets that introduced the problems in
the first two patches?

- Arnaldo
>  
> > James Clark (4):
> >   perf symbols: Remove map from list before updating addresses
> >   perf maps: Re-use __maps__free_maps_by_name()
> >   perf symbols: Update kcore map before merging in remaining symbols
> >   perf symbols: Fix ownership of string in dso__load_vmlinux()
> > 
> >  tools/perf/util/maps.c   | 14 ++++++------
> >  tools/perf/util/symbol.c | 49 ++++++++++++++++++++++++----------------
> >  2 files changed, 36 insertions(+), 27 deletions(-)
> > 
> > -- 
> > 2.34.1